(1973). Acid sulphate soils. Proceedings of the International symposium on Acid sulphate soils 13-20 August 1972, Wageningen, the Netherlands : Vol. 1-2. Wageningen: ILRI,.
Acid sulphate soils: Proceedings of the International symposium on Acid sulphate soils 13-20 August 1972, Wageningen, the Netherlands : Vol. 1-2. Wageningen: ILRI; 1973.